:root {
  --ink: #191919;
  --muted: #5d6268;
  --line: #d9dde2;
  --paper: #ffffff;
  --surface: #f5f7f8;
  --surface-strong: #edf1f3;
  --red: #a40725;
  --red-dark: #7a061d;
  --teal: #0b6b63;
  --gold: #b36b00;
  --shadow: 0 18px 50px rgba(21, 28, 34, 0.12);
  color-scheme: light;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: 0;
}

button,
a {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.92) 48%, rgba(255, 255, 255, 0.62) 100%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: 1180px;
  min-height: 520px;
  padding: 72px 28px 56px;
  display: flex;
  align-items: center;
}

.hero-copy {
  max-width: 860px;
}

.hero-equation-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0, 0, 0, 0.08) 16%, black 52%, black 100%);
}

.equation-row {
  position: absolute;
  top: var(--top);
  left: 100%;
  white-space: nowrap;
  color: rgba(164, 7, 37, 0.17);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.2rem, 2.2vw, 2.05rem);
  font-style: italic;
  line-height: 1;
  animation: equation-drift var(--duration) linear infinite;
  animation-delay: var(--delay);
}

.equation-row-alt {
  color: rgba(11, 107, 99, 0.15);
  font-size: clamp(1rem, 1.75vw, 1.7rem);
}

.equation-row sub,
.equation-row sup {
  font-size: 0.62em;
  line-height: 0;
}

.equation-row sub {
  vertical-align: -0.32em;
}

.equation-row sup {
  vertical-align: 0.48em;
}

.equation-limits {
  display: inline-grid;
  grid-template-rows: 0.68em 1em 0.68em;
  place-items: center;
  margin: 0 0.08em;
  vertical-align: middle;
}

.equation-limits sup,
.equation-limits sub {
  font-size: 0.5em;
  line-height: 1;
  vertical-align: baseline;
}

.equation-limit-symbol {
  line-height: 0.9;
}

@keyframes equation-drift {
  from {
    transform: translateX(18vw);
  }

  to {
    transform: translateX(-150vw);
  }
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--red);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: 4rem;
  line-height: 1.02;
  font-weight: 780;
}

h2 {
  margin-bottom: 14px;
  font-size: 2.25rem;
  line-height: 1.12;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  line-height: 1.25;
}

.lead {
  max-width: 720px;
  margin-bottom: 26px;
  color: #34383d;
  font-size: 1.2rem;
}

.contact-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.contact-link,
.primary-button,
.secondary-button,
.nav-button,
.filter-button,
.page-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.contact-link {
  padding: 10px 13px;
  background: rgba(255, 255, 255, 0.82);
  color: #2c3035;
  font-size: 0.93rem;
  backdrop-filter: blur(10px);
}

.contact-link:hover,
.secondary-button:hover,
.nav-button:hover,
.filter-button:hover,
.page-button:hover {
  border-color: rgba(164, 7, 37, 0.32);
  color: var(--red-dark);
}

.pdf-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.primary-button,
.secondary-button {
  padding: 11px 16px;
  font-weight: 750;
}

.primary-button {
  border-color: var(--red);
  background: var(--red);
  color: white;
}

.primary-button:hover {
  background: var(--red-dark);
  transform: translateY(-1px);
}

.secondary-button {
  background: var(--paper);
  color: var(--ink);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 247, 248, 0.94);
  backdrop-filter: blur(14px);
}

.nav-button {
  min-width: 128px;
  padding: 9px 12px;
  background: transparent;
  color: #363b40;
}

.nav-button.is-active,
.filter-button.is-active,
.page-button.is-active {
  border-color: var(--red);
  background: #fff4f5;
  color: var(--red-dark);
}

.content-section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 64px 28px 72px;
  scroll-margin-top: 82px;
}

.reveal-section {
  opacity: 1;
  transform: none;
}

.scroll-reactive .reveal-section {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 480ms ease,
    transform 480ms ease;
}

.scroll-reactive .reveal-section.is-visible,
.reveal-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.section-title {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-intro {
  color: var(--muted);
  font-size: 1.06rem;
}

.education-card,
.skill-card,
.timeline-item,
.focus-panel,
.current-panel,
.continuing-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.split-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
}

.focus-panel,
.current-panel,
.continuing-panel {
  padding: 22px;
}

.current-panel {
  border-left: 5px solid var(--teal);
}

.tag-cloud,
.stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 9px;
  border: 1px solid rgba(11, 107, 99, 0.22);
  border-radius: 999px;
  background: #eff8f7;
  color: #104641;
  font-size: 0.86rem;
  font-weight: 650;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.filter-button,
.page-button {
  min-width: 112px;
  padding: 8px 13px;
  background: var(--paper);
  color: #34383d;
  font-weight: 700;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 24px;
  padding: 22px;
}

.timeline-period {
  display: flex;
  gap: 8px;
  color: var(--red-dark);
  font-weight: 800;
}

.timeline-content p {
  margin-bottom: 9px;
}

.unit {
  color: var(--muted);
  font-style: italic;
}

.role {
  color: var(--teal);
  font-weight: 750;
}

.education-grid,
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.education-card,
.skill-card {
  padding: 20px;
}

.detail-list {
  margin: 14px 0 0;
  padding-left: 19px;
  color: #42484e;
  font-size: 0.94rem;
}

.detail-list li {
  margin-bottom: 7px;
}

.date-pill {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  margin-bottom: 14px;
  padding: 5px 9px;
  border-radius: 999px;
  background: #f6ecdc;
  color: #6b3c00;
  font-weight: 800;
  font-size: 0.86rem;
}

.note {
  color: var(--red-dark);
  font-weight: 750;
}

.skill-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.skill-heading svg,
.contact-link svg,
.primary-button svg,
.secondary-button svg,
.nav-button svg,
.timeline-period svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.skill-card ul,
.continuing-panel ul {
  margin: 0;
  padding-left: 20px;
}

.skill-card li,
.continuing-panel li {
  margin-bottom: 8px;
}

.continuing-panel {
  margin-top: 14px;
}

.continuing-panel p {
  margin: 16px 0 0;
  color: var(--muted);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.research-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 20px;
}

.research-card-wide {
  grid-column: 1 / -1;
}

.publication-list {
  display: grid;
  gap: 16px;
}

.publication-group {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.publication-group:first-child {
  border-top: 0;
  padding-top: 0;
}

.publication-group h4 {
  margin: 0 0 10px;
  color: var(--red-dark);
  font-size: 0.96rem;
}

.publication-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 12px;
  align-items: start;
  margin-bottom: 14px;
}

.publication-item .date-pill {
  grid-row: span 3;
  margin-bottom: 0;
}

.publication-item p {
  grid-column: 2;
  margin-bottom: 0;
  color: #363b40;
}

.publication-item a {
  grid-column: 2;
  overflow-wrap: anywhere;
  color: var(--teal);
  font-size: 0.9rem;
  font-weight: 700;
}

.activity-list {
  margin: 0;
  padding-left: 20px;
}

.activity-list li {
  margin-bottom: 9px;
  color: #363b40;
}

.pdf-controls {
  justify-content: space-between;
  margin-bottom: 18px;
}

.page-toggle {
  display: flex;
  gap: 8px;
}

.pdf-viewer {
  overflow: auto;
  max-height: 86vh;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #cbd1d7;
  box-shadow: var(--shadow);
}

.pdf-viewer img {
  width: min(100%, 900px);
  margin: 0 auto;
  background: white;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 920px) {
  .hero-inner {
    min-height: 0;
    padding-top: 48px;
  }

  .education-grid,
  .skills-grid,
  .research-grid,
  .split-layout {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .site-nav {
    justify-content: flex-start;
    overflow-x: auto;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 2.55rem;
  }

  h2 {
    font-size: 1.7rem;
  }

  .hero-inner,
  .content-section {
    padding-left: 18px;
    padding-right: 18px;
  }

  .pdf-controls,
  .page-toggle,
  .contact-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .contact-link,
  .primary-button,
  .secondary-button,
  .filter-button,
  .page-button {
    width: 100%;
    justify-content: center;
  }

  .nav-button {
    min-width: 112px;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .scroll-reactive .reveal-section,
  .reveal-section {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .equation-row {
    animation: none;
    transform: translateX(-42vw);
  }
}

@media print {
  .hero-equation-field,
  .site-nav,
  .pdf-controls,
  .site-footer {
    display: none;
  }

  .hero,
  .content-section {
    background: white;
  }

  .hero-inner,
  .content-section {
    max-width: none;
    padding: 20px;
  }
}